FreeFileSync is an Open-Source folder comparison and synchronization tool.
To know more about FreeFileSync click here
To install FreeFileSync on linux mint 12
1.Open terminal.To open terminal in linux mint, click Menu button and select terminal or type terminal in the search field and click terminal.
2.Type the below code in terminal and hit enter.
sudo add-apt-repository ppa:freefilesync/ffs
3.Type your linux mint password if needed.
4.Then press enter to continue or ctrl-c to cancel adding the ppa.
5.Type below command and hit enter
sudo apt-get update
6.Then type below command and press enter
sudo apt-get install freefilesync
7.Type y and hit enter to confirm FreeFileSync installation.